We provided the best estimation of the DUOX2 mutation rate (29%) for CH/SCH patients in Guangxi, China.
Most one or two DUOX2 pathogenic variants turned out to be SCH or TCH.
Patients with three or more DUOX2 pathogenic variants were mostly associated with PCH.
The coexistence of multiple pathogenic variants may have contributed to the severity of the hypothyroid condition.
We reported 8 novel variants in DUOX2 and one novel variant in TG.